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Condensed Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended
	Apr. 30, 2020	Apr. 30, 2019
Statement Of Income And Comprehensive Income [Abstract]
Net (loss) income	$ (138,442)	$ 32,585
Other comprehensive (loss) income:
Foreign currency translation	(12,617)	(3,800)
Change in unrealized (losses) gains on marketable securities, net of tax	(304)	186
Total other comprehensive (loss) income	(12,921)	(3,614)
Comprehensive (loss) income	$ (151,363)	$ 28,971

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Amount after tax of increase (decrease) in equity from transactions and other events and circumstances from net income and other comprehensive income, attributable to parent entity. Excludes changes in equity resulting from investments by owners and distributions to owners.

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